Tuning the Performance of Composite Membranes by Optimizing PDMS Content and Cross-Linking Time for Solvent Resistant Nanofiltration

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• 作者：Yujing Zhang ; Haoqin Zhang ; Yifan Li ; Heng Mao ; Guanghui Yang ; Jingtao Wang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：June 17, 2015
• 年：2015
• 卷：54
• 期：23
• 页码：6175-6186
• 全文大小：810K
• ISSN：1520-5045

文摘

Herein, a series of composite membranes with optimized solvent permeance and rejection are prepared by combining the advantages of hybridization and cross-linking techniques. Polyethylenimine (PEI) and hydroxyl terminated trifluoride polydimethylsiloxane (PDMS) are cross-linked with trimesoyl chloride as the skin layer, which is isotropic rather than hierarchical. The chain mobility of PEI is inhibited upon hybridization and cross-linking, affording enhanced solvent resistance and thermal/mechanical stabilities. The composite membrane achieves high rejection ability with the rejection of PEG 1000 of about 100%. Additionally, the synergy of hydrophilic PEI and hydrophobic PDMS segments gives acceptable solvent permeances for acetone (up to 2.7 L m^鈥? h^鈥? bar^鈥?) and ethyl acetate (up to 1.4 L m^鈥? h^鈥? bar^鈥?). The membrane microstructures are facilely tuned by regulating PDMS content and cross-linking time, allowing the efficient optimization of solvent resistant nanofiltration performances. Moreover, the operational stability and the separation of lotus seedpod proanthocyanidins鈥揺thanol/water mixtures are investigated to evaluate the practical application of the composite membrane.